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प्रश्न
Give one example of a food chain having four organisms. Below each organism write the three appropriate terms from the part (a) above which you think it represents.
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उत्तर
Grass → Grasshopper → Frog → Bird
Producer Primary consumer Secondary consumer Tertiary consumer
Autotroph Herbivore Carnivore Large carnivore
1st trophic level 2nd trophic level 3rd trophic level 4th trophic level
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संबंधित प्रश्न
What is a trophic level?
What is a 'food web'? Show its formation.
In a food chain, the initial organism is usually :
(a) photosynthetic
(b) herbivore
(c) saprophytic
(d) parasitic
One of the following is not a consumer. This one is :
(a) giraffe
(b) antelope
(c) algae
(d) alligator
What would happen to the number of rabbits and grass plants if the number of foxes decreased?
'If we excessively use pesticides to protect the crops from diseases, then it may cause long-term damage to mankind'. Justify this statement.
Explain why, a food chain usually cannot have more than three or four steps.
Calculate the amount of energy that will be available to big fish in the following food chain, if 10,000 J of energy is available to small algae from the sun :
Small algae → Zooplankton → Fish → Big fish
Which of the following limits the number of trophic levels in a food chain?
(a) insufficient food supply from producer level
(b) decrease in energy at higher trophic levels
(c) increase in the number of organisms at higher trophic levels
(d) accumulation of harmful chemicals at higher trophic levels
What percentage of sun's energy falling on the leaves of green plants is utilised by the plants in the process of photosynthesis and stored as chemical energy of food?
(a) 99 per cent
(b) 10 per cent
(c) 1 per cent
(d) 20 per cent
Which of the following gets the minimum energy through the food chain in an ecosystem?
(a) carnivore
(b) large carnivore
(c) producer
(d) herbivore
Most of the water surface of a lake is covered with algae. This algae is part of the food chain which also includes small fish, bird, larvae and big fish. Which of the following will obtain the maximum energy?
(a) big fish
(b) bird
(c) larvae
(d) small fish
A food chain consists of fish, larvae, phytoplanktons and birds. The level of pesticides in water in which the fish, larvae and phytoplanktons live is quite high.
Which organism will have the maximum amount of pesticides accumulated through the food chain? What is this process known as?
Your mother always thought that fruit juices are very healthy for everyone. One day she read in the newspaper that some brands of fruit juices in the market have been found to contain certain level of pesticides in them. She got worried as pesticides are injurious to our health.
(a) How would you explain to your mother about fruit juices getting contaminated with pesticides?
(b) It is said that when these harmful pesticides enter our body as well as in the bodies of other organisms they get accumulated and beyond a limit cause harm and damage to our organs. Name the phenomenon and write about it.
"Energy flow in food chains is always unidirectional". Justify this statement. Explain how the pesticides enter a food chain and subsequently get into our body.
A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in ______.
Food chains are very important for the survival of most species.
If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy?
Each level in the food chain is called a ______ level.
Analogy:
Primary Consumer: Goat, Cow:: Secondary Consumer: ______.
